Hmmm, apparently the default is "sys" as I determined by looking at /etc/nfssec.conf
Here are the three commands and their output: andre at sol:~# mount -o sec=sys /mnt/mandibox nfs mount: mandibox:/home/andre: No such file or directory andre at sol:~# mount -o sec=none /mnt/mandibox nfs mount: mount: /mnt/mandibox: Permission denied andre at sol:~# mount -o sec=dh /mnt/mandibox nfs mount: errors constructing security related data -- This message posted from opensolaris.org